LOL!!!, Kids are way more work than that Bro. Besides, how often do you go out from 5-9 on weekdays? Wait till they need someone home to supervise their homework and stuff. Once your a family man, it literally takes a concious effort to neglect your family to train any respectable amount of time.
I think the only way to realisticaly do it would be to open a school, and have your kids do their homework in the office after school before your classes start.
The other option is to put your Kid in a competetive gymnastics club,and they will be too buy training to notice your not there. But then your neglecting your wife, and at some point you will find she's been doing some guy wile your busy in the Kwoon.